Functions inside kernel modules that use __ref will end up being placed in .ARM.exidx.ref.text section by gcc.
Currently we don't consider adding these functions to arm unwind tables. Hence, if we turn slub debug on by default we end up with the messages of this sort: unwind: Index not found bf0011e0 This is because slub debug saves stack trace of allocation's and free's. Therefore, we end up seeing a flood of these messages in dmesg since its not able to locate these functions. Fix this by adding .ref.text section to arm unwind tables. Tested-by: Laura Abbott <[email protected]> Signed-off-by: Vignesh Radhakrishnan <[email protected]> CC: Russell King <[email protected]> CC: Andrew Morton <[email protected]> CC: Laura Abbott <[email protected]> CC: Andrey Ryabinin <[email protected]> CC: Andrey Konovalov <[email protected]> --- arch/arm/include/asm/module.h | 1 + arch/arm/kernel/module.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/arch/arm/include/asm/module.h b/arch/arm/include/asm/module.h index ed690c4..17640c9 100644 --- a/arch/arm/include/asm/module.h +++ b/arch/arm/include/asm/module.h @@ -14,6 +14,7 @@ enum { ARM_SEC_DEVEXIT, ARM_SEC_HOT, ARM_SEC_UNLIKELY, + ARM_SEC_REF, ARM_SEC_MAX, }; diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c index 2e11961..846b888 100644 --- a/arch/arm/kernel/module.c +++ b/arch/arm/kernel/module.c @@ -308,6 +308,8 @@ int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, maps[ARM_SEC_UNLIKELY].unw_sec = s; else if (strcmp(".ARM.exidx.text.hot", secname) == 0) maps[ARM_SEC_HOT].unw_sec = s; + else if (strcmp(".ARM.exidx.ref.text", secname) == 0) + maps[ARM_SEC_REF].unw_sec = s; else if (strcmp(".init.text", secname) == 0) maps[ARM_SEC_INIT].txt_sec = s; else if (strcmp(".text", secname) == 0) @@ -318,6 +320,8 @@ int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, maps[ARM_SEC_UNLIKELY].txt_sec = s; else if (strcmp(".text.hot", secname) == 0) maps[ARM_SEC_HOT].txt_sec = s; + else if (strcmp(".ref.text", secname) == 0) + maps[ARM_SEC_REF].txt_sec = s; } for (i = 0; i < ARM_SEC_MAX; i++) -- 1.8.2.1 -- Thanks and regards, Vignesh Radhakrishnan QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
