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signal/alpha: Document a conflict with SI_USER for SIGFPE 

Setting si_code to 0 is the same as setting si_code to SI_USER.  This
is the same si_code as SI_USER.  Posix and common sense requires that
SI_USER not be a signal specific si_code.  As such this use of 0 for
the si_code is a pretty horribly broken ABI.

Cc: Helge Deller <deller@gmx.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: linux-alpha@vger.kernel.org
History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
Ref: 0a635c7a84cf ("Fill in siginfo_t.")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-04-15 09:53:50 -05:00
parent 60cc43fc88
commit 5278c0e814
1 changed files with 1 additions and 1 deletions
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2
arch/alpha/kernel/osf_sys.c
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@ -872,7 +872,7 @@ SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr; fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
if (fex) { if (fex) {
siginfo_t info; siginfo_t info;
int si_code = 0; int si_code = FPE_FIXME;
if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND; if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES; if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;