diff options
| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2013-11-19 12:26:09 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-11-20 09:04:53 +0100 |
| commit | aa7e04b3808614980d474735cdb0bf35ac5cdf26 (patch) | |
| tree | bb6e80bf8f9779b33c8c54baa6c09fa049c9ec33 /arch/s390/kernel | |
| parent | b4789b8e6be3151a955ade74872822f30e8cd914 (diff) | |
| download | linux-aa7e04b3808614980d474735cdb0bf35ac5cdf26.tar.gz linux-aa7e04b3808614980d474735cdb0bf35ac5cdf26.tar.bz2 linux-aa7e04b3808614980d474735cdb0bf35ac5cdf26.zip | |
s390/signal: always restore saved runtime instrumentation psw bit
Commit "s390: fix handling of runtime instrumentation psw bit" (5ebf250dab)
changed the behavior of setting the runtime instrumentation psw bit. This
commit restores the original logic:
1. When returning from the signal handler, the runtime instrumentation psw bit
is restored to its saved state.
2. If the runtime instrumentation psw bit is enabled during the signal handler,
it is always turned off when leaving the signal handler. The saved state
is restored as described in 1. That also implies that turning on runtime
instrumentation in the signal handler is only effective while running in the
signal context.
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/compat_signal.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/signal.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index 6e2442978409..95e7ba0fbb7e 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -194,7 +194,7 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs) return -EINVAL; /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */ - regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | + regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) | (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 | (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 | (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE); diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c index fb535874a246..d8fd508ccd1e 100644 --- a/arch/s390/kernel/signal.c +++ b/arch/s390/kernel/signal.c @@ -94,7 +94,7 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) return -EINVAL; /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */ - regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | + regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) | (user_sregs.regs.psw.mask & (PSW_MASK_USER | PSW_MASK_RI)); /* Check for invalid user address space control. */ if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME) |