diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/perf/callchain.c | 48 |
1 files changed, 24 insertions, 24 deletions
diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index cbc251981209..c9a78c6e4361 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -161,18 +161,6 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret) return read_user_stack_slow(ptr, ret, 8); } -static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) -{ - if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) || - ((unsigned long)ptr & 3)) - return -EFAULT; - - if (!probe_user_read(ret, ptr, sizeof(*ret))) - return 0; - - return read_user_stack_slow(ptr, ret, 4); -} - static inline int valid_user_sp(unsigned long sp, int is_64) { if (!sp || (sp & 7) || sp > (is_64 ? TASK_SIZE : 0x100000000UL) - 32) @@ -277,19 +265,9 @@ static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, } #else /* CONFIG_PPC64 */ -/* - * On 32-bit we just access the address and let hash_page create a - * HPTE if necessary, so there is no need to fall back to reading - * the page tables. Since this is called at interrupt level, - * do_page_fault() won't treat a DSI as a page fault. - */ -static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) +static int read_user_stack_slow(void __user *ptr, void *buf, int nb) { - if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) || - ((unsigned long)ptr & 3)) - return -EFAULT; - - return probe_user_read(ret, ptr, sizeof(*ret)); + return 0; } static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, @@ -313,6 +291,28 @@ static inline int valid_user_sp(unsigned long sp, int is_64) #endif /* CONFIG_PPC64 */ /* + * On 32-bit we just access the address and let hash_page create a + * HPTE if necessary, so there is no need to fall back to reading + * the page tables. Since this is called at interrupt level, + * do_page_fault() won't treat a DSI as a page fault. + */ +static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) +{ + int rc; + + if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) || + ((unsigned long)ptr & 3)) + return -EFAULT; + + rc = probe_user_read(ret, ptr, sizeof(*ret)); + + if (IS_ENABLED(CONFIG_PPC64) && rc) + return read_user_stack_slow(ptr, ret, 4); + + return rc; +} + +/* * Layout for non-RT signal frames */ struct signal_frame_32 { |