[hppa] Reduce SIGRTMIN from 37 to 32 to behave like other Linux architectures (Closes: #766635)
svn path=/dists/sid/linux/; revision=22027
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Ben Hutchings
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338bc62d47
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0fbdfcec78
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@ -155,6 +155,8 @@ linux (3.16.7-1) UNRELEASED; urgency=medium
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* [x86] Backport Thunderbolt support on Apple computers from 3.17
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* [x86] linux-image: Remove lilo from suggested boot loaders
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* [amd64] linux-image: Add grub-efi to suggested boot loaders
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* [hppa] Reduce SIGRTMIN from 37 to 32 to behave like other Linux
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architectures (Closes: #766635)
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[ Mauricio Faria de Oliveira ]
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* [ppc64el] Disable CONFIG_CMDLINE{,_BOOL} usage for setting consoles
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100
debian/patches/bugfix/parisc/parisc-reduce-sigrtmin-from-37-to-32-to-behave-like-.patch
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debian/patches/bugfix/parisc/parisc-reduce-sigrtmin-from-37-to-32-to-behave-like-.patch
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@ -0,0 +1,100 @@
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From: Helge Deller <deller@gmx.de>
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Date: Fri, 10 Oct 2014 22:20:17 +0200
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Subject: parisc: Reduce SIGRTMIN from 37 to 32 to behave like other Linux
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architectures
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Origin: https://git.kernel.org/linus/1f25df2eff5b25f52c139d3ff31bc883eee9a0ab
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Bug-Debian: https://bugs.debian.org/766635
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This patch reduces the value of SIGRTMIN on PARISC from 37 to 32, thus
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increasing the number of available RT signals and bring it in sync with other
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Linux architectures.
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Historically we wanted to natively support HP-UX 32bit binaries with the
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PA-RISC Linux port. Because of that we carried the various available signals
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from HP-UX (e.g. SIGEMT and SIGLOST) and folded them in between the native
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Linux signals. Although this was the right decision at that time, this
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required us to increase SIGRTMIN to at least 37 which left us with 27 (64-37)
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RT signals.
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Those 27 RT signals haven't been a problem in the past, but with the upcoming
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importance of systemd we now got the problem that systemd alloctes (hardcoded)
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signals up to SIGRTMIN+29 which is beyond our NSIG of 64. Because of that we
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have not been able to use systemd on the PARISC Linux port yet.
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Of course we could ask the systemd developers to not use those hardcoded
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values, but this change is very unlikely, esp. with PA-RISC being a niche
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architecture.
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The other possibility would be to increase NSIG to e.g. 128, but this would
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mean to duplicate most of the existing Linux signal handling code into the
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parisc specific Linux kernel tree which would most likely introduce lots of new
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bugs beside the code duplication.
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The third option is to drop some HP-UX signals and shuffle some other signals
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around to bring SIGRTMIN to 32. This is of course an ABI change, but testing
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has shown that existing Linux installations are not visibly affected by this
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change - most likely because we move those signals around which are rarely used
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and move them to slots which haven't been used in Linux yet. In an existing
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installation I was able to exchange either the Linux kernel or glibc (or both)
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without affecting the boot process and installed applications.
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Dropping the HP-UX signals isn't an issue either, since support for HP-UX was
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basically dropped a few months back with Kernel 3.14 in commit
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f5a408d53edef3af07ac7697b8bc54a755628450 already, when we changed EWOULDBLOCK
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to be equal to EAGAIN.
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So, even if this is an ABI change, it's better to change it now and thus bring
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PARISC Linux in sync with other architectures to avoid other issues in the
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future.
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Signed-off-by: Helge Deller <deller@gmx.de>
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Cc: Carlos O'Donell <carlos@systemhalted.org>
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Cc: John David Anglin <dave.anglin@bell.net>
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Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
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Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
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Cc: PARISC Linux Kernel Mailinglist <linux-parisc@vger.kernel.org>
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Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
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---
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arch/parisc/include/uapi/asm/signal.h | 16 ++++++----------
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1 file changed, 6 insertions(+), 10 deletions(-)
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diff --git a/arch/parisc/include/uapi/asm/signal.h b/arch/parisc/include/uapi/asm/signal.h
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index f5645d6..10df707 100644
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--- a/arch/parisc/include/uapi/asm/signal.h
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+++ b/arch/parisc/include/uapi/asm/signal.h
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@@ -8,12 +8,12 @@
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#define SIGTRAP 5
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#define SIGABRT 6
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#define SIGIOT 6
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-#define SIGEMT 7
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+#define SIGSTKFLT 7
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#define SIGFPE 8
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#define SIGKILL 9
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#define SIGBUS 10
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#define SIGSEGV 11
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-#define SIGSYS 12 /* Linux doesn't use this */
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+#define SIGXCPU 12
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#define SIGPIPE 13
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#define SIGALRM 14
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#define SIGTERM 15
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@@ -32,16 +32,12 @@
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#define SIGTTIN 27
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#define SIGTTOU 28
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#define SIGURG 29
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-#define SIGLOST 30 /* Linux doesn't use this either */
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-#define SIGUNUSED 31
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-#define SIGRESERVE SIGUNUSED
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-
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-#define SIGXCPU 33
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-#define SIGXFSZ 34
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-#define SIGSTKFLT 36
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+#define SIGXFSZ 30
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+#define SIGUNUSED 31
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+#define SIGSYS 31 /* Linux doesn't use this */
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/* These should not be considered constants from userland. */
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-#define SIGRTMIN 37
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+#define SIGRTMIN 32
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#define SIGRTMAX _NSIG /* it's 44 under HP/UX */
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/*
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@ -449,3 +449,4 @@ features/x86/apple-tb/0028-thunderbolt-select-CRC32-in-Kconfig.patch
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features/x86/apple-tb/0029-thunderbolt-Correct-the-size-argument-to-devm_kzallo.patch
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features/x86/apple-tb/0030-thunderbolt-Use-kcalloc.patch
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features/x86/apple-tb/0031-thunderbolt-Clear-hops-before-overwriting.patch
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bugfix/parisc/parisc-reduce-sigrtmin-from-37-to-32-to-behave-like-.patch
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