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There will be a VDSO function to unlock non-contended robust futexes in user space. The unlock sequence is racy vs. clearing the list_pending_op pointer in the task's robust list head. To plug this race the kernel needs to know the critical section window so it can clear the pointer when the task is interrupted within that race window. The window is determined by labels in the inline assembly. Add these symbols to the vdso2c generator and use them in the VDSO VMA code to update the critical section addresses in mm_struct::futex on (re)map(). The symbols are not exported to user space, but available in the debug version of the vDSO. Signed-off-by: Thomas Gleixner <tglx@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: André Almeida <andrealmeid@igalia.com> Link: https://patch.msgid.link/20260602090535.828312645@kernel.org |
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| .. | ||
| .gitignore | ||
| cpufeaturemasks.awk | ||
| gen-insn-attr-x86.awk | ||
| insn_decoder_test.c | ||
| insn_sanity.c | ||
| Makefile | ||
| objdump_reformat.awk | ||
| relocs_32.c | ||
| relocs_64.c | ||
| relocs_common.c | ||
| relocs.c | ||
| relocs.h | ||
| vdso2c.c | ||
| vdso2c.h | ||