diff options
| author | Xin Li <[email protected]> | 2023-03-21 23:17:58 -0700 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2023-08-08 09:31:43 +0200 |
| commit | 39163d5479285a36522b6e8f9cc568cc4987db08 (patch) | |
| tree | 60381ff5e9234da868a1b48de46862b54b9b85ca /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | bee6cf1a80b54548a039e224c651bb15b644a480 (diff) | |
x86/vdso: Choose the right GDT_ENTRY_CPUNODE for 32-bit getcpu() on 64-bit kernel
The vDSO getcpu() reads CPU ID from the GDT_ENTRY_CPUNODE entry when the RDPID
instruction is not available. And GDT_ENTRY_CPUNODE is defined as 28 on 32-bit
Linux kernel and 15 on 64-bit. But the 32-bit getcpu() on 64-bit Linux kernel
is compiled with 32-bit Linux kernel GDT_ENTRY_CPUNODE, i.e., 28, beyond the
64-bit Linux kernel GDT limit. Thus, it just fails _silently_.
When BUILD_VDSO32_64 is defined, choose the 64-bit Linux kernel GDT definitions
to compile the 32-bit getcpu().
Fixes: 877cff5296faa6e ("x86/vdso: Fake 32bit VDSO build on 64bit compile for vgetcpu")
Reported-by: kernel test robot <[email protected]>
Reported-by: Shan Kang <[email protected]>
Signed-off-by: Xin Li <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/oe-lkp/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions