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jump_label: Implement generic support for relative references

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To reduce the size taken up by absolute references in jump label
entries themselves and the associated relocation records in the
.init segment, add support for emitting them as relative references
instead.

Note that this requires some extra care in the sorting routine, given
that the offsets change when entries are moved around in the jump_entry
table.

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Arnd Bergmann <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Jessica Yu <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
This commit is contained in:
Ard Biesheuvel 2018-09-18 23:51:37 -07:00 • committed by Thomas Gleixner
commit 50ff18ab49
3 changed files with 52 additions and 1 deletions
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3
arch/Kconfig
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@ -359,6 +359,9 @@ config HAVE_PERF_USER_STACK_DUMP
config HAVE_ARCH_JUMP_LABEL
bool
config HAVE_ARCH_JUMP_LABEL_RELATIVE
bool
config HAVE_RCU_TABLE_FREE
bool