linux_dsm_epyc7002/arch/mips/lib/bswapdi.c
Harvey Hunt aedcfbe065 MIPS: lib: Mark intrinsics notrace
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>
2016-05-28 12:35:11 +02:00

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);