mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 22:53:20 +00:00
aedcfbe065
On certain MIPS32 devices, the ftrace tracer "function_graph" uses __lshrdi3() during the capturing of trace data. ftrace then attempts to trace __lshrdi3() which leads to infinite recursion and a stack overflow. Fix this by marking __lshrdi3() as notrace. Mark the other compiler intrinsics as notrace in case the compiler decides to use them in the ftrace path. Signed-off-by: Harvey Hunt <harvey.hunt@imgtec.com> Cc: <linux-mips@linux-mips.org> Cc: <linux-kernel@vger.kernel.org> Cc: <stable@vger.kernel.org> # 4.2.x- Patchwork: https://patchwork.linux-mips.org/patch/13354/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
16 lines
502 B
C
16 lines
502 B
C
#include <linux/module.h>
|
|
|
|
unsigned long long notrace __bswapdi2(unsigned long long u)
|
|
{
|
|
return (((u) & 0xff00000000000000ull) >> 56) |
|
|
(((u) & 0x00ff000000000000ull) >> 40) |
|
|
(((u) & 0x0000ff0000000000ull) >> 24) |
|
|
(((u) & 0x000000ff00000000ull) >> 8) |
|
|
(((u) & 0x00000000ff000000ull) << 8) |
|
|
(((u) & 0x0000000000ff0000ull) << 24) |
|
|
(((u) & 0x000000000000ff00ull) << 40) |
|
|
(((u) & 0x00000000000000ffull) << 56);
|
|
}
|
|
|
|
EXPORT_SYMBOL(__bswapdi2);
|