This section will contain read-only data for values of kernel symbol flags in the form of an 8-bit bitsets for each kernel symbol. Each bit in the bitset represents a flag value defined by ksym_flags enumeration.
The kflagstab section introduces a 1-byte overhead for each symbol exported in the ksymtab. Given that typical kernel builds contain roughly a few thousand exported symbols, the resulting memory increase is negligible. Signed-off-by: Siddharth Nayyar <[email protected]> --- include/asm-generic/vmlinux.lds.h | 7 +++++++ scripts/module.lds.S | 1 + 2 files changed, 8 insertions(+) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index eeb070f330bd..8f825dcbfae4 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -536,6 +536,13 @@ __stop___kcrctab_gpl = .; \ } \ \ + /* Kernel symbol flags table */ \ + __kflagstab : AT(ADDR(__kflagstab) - LOAD_OFFSET) { \ + __start___kflagstab = .; \ + KEEP(*(SORT(___kflagstab+*))) \ + __stop___kflagstab = .; \ + } \ + \ /* Kernel symbol table: strings */ \ __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ *(__ksymtab_strings) \ diff --git a/scripts/module.lds.S b/scripts/module.lds.S index 054ef99e8288..d7a8ba278dfc 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -23,6 +23,7 @@ SECTIONS { __ksymtab_gpl 0 : ALIGN(8) { *(SORT(___ksymtab_gpl+*)) } __kcrctab 0 : ALIGN(4) { *(SORT(___kcrctab+*)) } __kcrctab_gpl 0 : ALIGN(4) { *(SORT(___kcrctab_gpl+*)) } + __kflagstab 0 : ALIGN(1) { *(SORT(___kflagstab+*)) } .ctors 0 : ALIGN(8) { *(SORT(.ctors.*)) *(.ctors) } .init_array 0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) } -- 2.53.0.473.g4a7958ca14-goog
