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authorEric W. Biederman <ebiederm@xmission.com>2018-04-17 17:10:34 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-04-25 10:40:58 -0500
commite821fa42452508bba34be6e54ec58cd2ee23626c (patch)
tree75f38c425d762f12f872ecc9155876ca5a002542 /arch
parentsignal/alpha: Replace TRAP_FIXME with TRAP_UNK (diff)
downloadlinux-dev-e821fa42452508bba34be6e54ec58cd2ee23626c.tar.xz
linux-dev-e821fa42452508bba34be6e54ec58cd2ee23626c.zip
signal/powerpc: Replace TRAP_FIXME with TRAP_UNK
Using an si_code of 0 that aliases with SI_USER is clearly the wrong thing todo, and causes problems in interesting ways. For use in unknown_exception the recently defined TRAP_UNK semantically is a perfect fit. For use in RunModeException it looks like something more specific than TRAP_UNK could be used. No one has bothered to find a better fit than the broken si_code of 0 in all of these years and I don't see an obvious better fit so TRAP_UNK is switching RunModeException to return TRAP_UNK is clearly an improvement. Recent history suggests no actually cares about crazy corner cases of the kernel behavior like this so I don't expect any regressions from changing this. However if something does happen this change is easy to revert. Though I wonder if SIGKILL might not be a better fit. Cc: Paul Mackerras <paulus@samba.org> Cc: Kumar Gala <kumar.gala@freescale.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linuxppc-dev@lists.ozlabs.org Fixes: 9bad068c24d7 ("[PATCH] ppc32: support for e500 and 85xx") Fixes: 0ed70f6105ef ("PPC32: Provide proper siginfo information on various exceptions.") History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/uapi/asm/siginfo.h8
-rw-r--r--arch/powerpc/kernel/traps.c4
2 files changed, 2 insertions, 10 deletions
diff --git a/arch/powerpc/include/uapi/asm/siginfo.h b/arch/powerpc/include/uapi/asm/siginfo.h
index 0437afc9ef3c..1d51d9b88221 100644
--- a/arch/powerpc/include/uapi/asm/siginfo.h
+++ b/arch/powerpc/include/uapi/asm/siginfo.h
@@ -15,12 +15,4 @@
#include <asm-generic/siginfo.h>
-/*
- * SIGTRAP si_codes
- */
-#ifdef __KERNEL__
-#define TRAP_FIXME 0 /* Broken dup of SI_USER */
-#endif /* __KERNEL__ */
-
-
#endif /* _ASM_POWERPC_SIGINFO_H */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index fdf9400beec8..0e17dcb48720 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -969,7 +969,7 @@ void unknown_exception(struct pt_regs *regs)
printk("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
regs->nip, regs->msr, regs->trap);
- _exception(SIGTRAP, regs, TRAP_FIXME, 0);
+ _exception(SIGTRAP, regs, TRAP_UNK, 0);
exception_exit(prev_state);
}
@@ -991,7 +991,7 @@ bail:
void RunModeException(struct pt_regs *regs)
{
- _exception(SIGTRAP, regs, TRAP_FIXME, 0);
+ _exception(SIGTRAP, regs, TRAP_UNK, 0);
}
void single_step_exception(struct pt_regs *regs)