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powerpc/signal32: Fix build failure with CONFIG_SPE 

Add missing fault exit label in unsafe_copy_from_user() in order to
avoid following build failure with CONFIG_SPE

  CC      arch/powerpc/kernel/signal_32.o
arch/powerpc/kernel/signal_32.c: In function 'restore_user_regs':
arch/powerpc/kernel/signal_32.c:565:36: error: macro "unsafe_copy_from_user" requires 4 arguments, but only 3 given
  565 |           ELF_NEVRREG * sizeof(u32));
      |                                    ^
In file included from ./include/linux/uaccess.h:11,
                 from ./include/linux/sched/task.h:11,
                 from ./include/linux/sched/signal.h:9,
                 from ./include/linux/rcuwait.h:6,
                 from ./include/linux/percpu-rwsem.h:7,
                 from ./include/linux/fs.h:33,
                 from ./include/linux/huge_mm.h:8,
                 from ./include/linux/mm.h:707,
                 from arch/powerpc/kernel/signal_32.c:17:
./arch/powerpc/include/asm/uaccess.h:428: note: macro "unsafe_copy_from_user" defined here
  428 | #define unsafe_copy_from_user(d, s, l, e) \
      |
arch/powerpc/kernel/signal_32.c:564:3: error: 'unsafe_copy_from_user' undeclared (first use in this function); did you mean 'raw_copy_from_user'?
  564 |   unsafe_copy_from_user(current->thread.evr, &sr->mc_vregs,
      |   ^~~~~~~~~~~~~~~~~~~~~
      |   raw_copy_from_user
arch/powerpc/kernel/signal_32.c:564:3: note: each undeclared identifier is reported only once for each function it appears in
make[3]: *** [arch/powerpc/kernel/signal_32.o] Error 1

Fixes: 627b72bee8 ("powerpc/signal32: Convert restore_[tm]_user_regs() to user access block")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/aad2cb1801a3cc99bc27081022925b9fc18a0dfb.1618159169.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-04-11 16:39:53 +00:00 committed by Michael Ellerman
parent c46bbf5d2d
commit af072b1a9d
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/signal_32.c
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@ -562,7 +562,7 @@ static long restore_user_regs(struct pt_regs *regs,
if (msr & MSR_SPE) {
/* restore spe registers from the stack */
unsafe_copy_from_user(current->thread.evr, &sr->mc_vregs,
ELF_NEVRREG * sizeof(u32));
ELF_NEVRREG * sizeof(u32), failed);
current->thread.used_spe = true;
} else if (current->thread.used_spe)
memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));