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Date:   Mon, 03 Apr 2017 02:57:48 -0700
From:   hpa@...or.com
To:     linux-tip-commits@...r.kernel.org,
        tip-bot for Peter Zijlstra <tipbot@...or.com>
CC:     torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, tglx@...utronix.de, fengguang.wu@...el.com,
        peterz@...radead.org
Subject: Re: [tip:x86/asm] debug: Fix __bug_table[] in arch linker scripts

On April 3, 2017 1:27:49 AM PDT, tip-bot for Peter Zijlstra <tipbot@...or.com> wrote:
>Commit-ID:  b5effd3815ccbe3df1a015a6d67d8a24a27813d5
>Gitweb:    
>http://git.kernel.org/tip/b5effd3815ccbe3df1a015a6d67d8a24a27813d5
>Author:     Peter Zijlstra <peterz@...radead.org>
>AuthorDate: Thu, 30 Mar 2017 17:49:27 +0200
>Committer:  Ingo Molnar <mingo@...nel.org>
>CommitDate: Mon, 3 Apr 2017 10:22:40 +0200
>
>debug: Fix __bug_table[] in arch linker scripts
>
>The kbuild test robot reported this build failure on a number
>of architectures:
>
> >         make.cross ARCH=arm
> >    lib/lib.a(bug.o): In function `find_bug':
> > >> lib/bug.c:135: undefined reference to `__start___bug_table'
> > >> lib/bug.c:135: undefined reference to `__stop___bug_table'
>
>Caused by:
>
>  19d436268dde ("debug: Add _ONCE() logic to report_bug()")
>
>Which moved the BUG_TABLE from RO_DATA_SECTION() to RW_DATA_SECTION(),
>but a number of architectures don't use RW_DATA_SECTION(), so they
>ended up with no __bug_table[] ...
>
>Ideally all those would use RW_DATA_SECTION() in their linker scripts,
>but that's for another day.
>
>Signed-off-by: Peter Zijlstra <peterz@...radead.org>
>Cc: Linus Torvalds <torvalds@...ux-foundation.org>
>Cc: Thomas Gleixner <tglx@...utronix.de>
>Cc: kbuild test robot <fengguang.wu@...el.com>
>Cc: kbuild-all@...org
>Cc: tipbuild@...or.com
>Link:
>http://lkml.kernel.org/r/20170330154927.o6qmgfp4bdhrajbm@hirez.programming.kicks-ass.net
>Signed-off-by: Ingo Molnar <mingo@...nel.org>
>---
> arch/arm/kernel/vmlinux-xip.lds.S  | 2 ++
> arch/arm/kernel/vmlinux.lds.S      | 2 ++
> arch/avr32/kernel/vmlinux.lds.S    | 1 +
> arch/blackfin/kernel/vmlinux.lds.S | 2 ++
> arch/c6x/kernel/vmlinux.lds.S      | 2 ++
> arch/cris/kernel/vmlinux.lds.S     | 2 ++
> arch/frv/kernel/vmlinux.lds.S      | 2 ++
> arch/ia64/kernel/vmlinux.lds.S     | 2 ++
> arch/mips/kernel/vmlinux.lds.S     | 1 +
> arch/powerpc/kernel/vmlinux.lds.S  | 2 ++
> arch/x86/kernel/vmlinux.lds.S      | 1 +
> 11 files changed, 19 insertions(+)
>
>diff --git a/arch/arm/kernel/vmlinux-xip.lds.S
>b/arch/arm/kernel/vmlinux-xip.lds.S
>index 37b2a11..8265b11 100644
>--- a/arch/arm/kernel/vmlinux-xip.lds.S
>+++ b/arch/arm/kernel/vmlinux-xip.lds.S
>@@ -242,6 +242,8 @@ SECTIONS
> 	}
> 	_edata_loc = __data_loc + SIZEOF(.data);
> 
>+	BUG_TABLE
>+
> #ifdef CONFIG_HAVE_TCM
>         /*
> 	 * We align everything to a page boundary so we can
>diff --git a/arch/arm/kernel/vmlinux.lds.S
>b/arch/arm/kernel/vmlinux.lds.S
>index ce18007..c83a7ba 100644
>--- a/arch/arm/kernel/vmlinux.lds.S
>+++ b/arch/arm/kernel/vmlinux.lds.S
>@@ -262,6 +262,8 @@ SECTIONS
> 	}
> 	_edata_loc = __data_loc + SIZEOF(.data);
> 
>+	BUG_TABLE
>+
> #ifdef CONFIG_HAVE_TCM
>         /*
> 	 * We align everything to a page boundary so we can
>diff --git a/arch/avr32/kernel/vmlinux.lds.S
>b/arch/avr32/kernel/vmlinux.lds.S
>index 17f2730..623d18d 100644
>--- a/arch/avr32/kernel/vmlinux.lds.S
>+++ b/arch/avr32/kernel/vmlinux.lds.S
>@@ -75,6 +75,7 @@ SECTIONS
> 
> 		_edata = .;
> 	}
>+	BUG_TABLE
> 
> 	BSS_SECTION(0, 8, 8)
> 	_end = .;
>diff --git a/arch/blackfin/kernel/vmlinux.lds.S
>b/arch/blackfin/kernel/vmlinux.lds.S
>index 68069a1..334ef81 100644
>--- a/arch/blackfin/kernel/vmlinux.lds.S
>+++ b/arch/blackfin/kernel/vmlinux.lds.S
>@@ -115,6 +115,8 @@ SECTIONS
> 	__data_lma = LOADADDR(.data);
> 	__data_len = SIZEOF(.data);
> 
>+	BUG_TABLE
>+
> 	/* The init section should be last, so when we free it, it goes into
>	 * the general memory pool, and (hopefully) will decrease
>fragmentation
> 	 * a tiny bit. The init section has a _requirement_ that it be
>diff --git a/arch/c6x/kernel/vmlinux.lds.S
>b/arch/c6x/kernel/vmlinux.lds.S
>index a1a5c16..29ebea4 100644
>--- a/arch/c6x/kernel/vmlinux.lds.S
>+++ b/arch/c6x/kernel/vmlinux.lds.S
>@@ -128,6 +128,8 @@ SECTIONS
> 		. = ALIGN(8);
> 	}
> 
>+	BUG_TABLE
>+
> 	_edata = .;
> 
> 	__bss_start = .;
>diff --git a/arch/cris/kernel/vmlinux.lds.S
>b/arch/cris/kernel/vmlinux.lds.S
>index 9795862..867f237 100644
>--- a/arch/cris/kernel/vmlinux.lds.S
>+++ b/arch/cris/kernel/vmlinux.lds.S
>@@ -68,6 +68,8 @@ SECTIONS
> 	__edata = . ;			/* End of data section. */
> 	_edata = . ;
> 
>+	BUG_TABLE
>+
> 	INIT_TASK_DATA_SECTION(PAGE_SIZE)
> 
> 	. = ALIGN(PAGE_SIZE);		/* Init code and data. */
>diff --git a/arch/frv/kernel/vmlinux.lds.S
>b/arch/frv/kernel/vmlinux.lds.S
>index aa6e573..3f44dcb 100644
>--- a/arch/frv/kernel/vmlinux.lds.S
>+++ b/arch/frv/kernel/vmlinux.lds.S
>@@ -102,6 +102,8 @@ SECTIONS
> 
>   _edata = .;			/* End of data section */
> 
>+  BUG_TABLE
>+
>   /* GP section */
>   . = ALIGN(L1_CACHE_BYTES);
>   _gp = . + 2048;
>diff --git a/arch/ia64/kernel/vmlinux.lds.S
>b/arch/ia64/kernel/vmlinux.lds.S
>index f89d20c..798026d 100644
>--- a/arch/ia64/kernel/vmlinux.lds.S
>+++ b/arch/ia64/kernel/vmlinux.lds.S
>@@ -192,6 +192,8 @@ SECTIONS {
> 		CONSTRUCTORS
> 	}
> 
>+	BUG_TABLE
>+
> 	. = ALIGN(16);	/* gp must be 16-byte aligned for exc. table */
> 	.got : AT(ADDR(.got) - LOAD_OFFSET) {
> 		*(.got.plt)
>diff --git a/arch/mips/kernel/vmlinux.lds.S
>b/arch/mips/kernel/vmlinux.lds.S
>index f0a0e6d..8ca2371 100644
>--- a/arch/mips/kernel/vmlinux.lds.S
>+++ b/arch/mips/kernel/vmlinux.lds.S
>@@ -97,6 +97,7 @@ SECTIONS
> 		DATA_DATA
> 		CONSTRUCTORS
> 	}
>+	BUG_TABLE
> 	_gp = . + 0x8000;
> 	.lit8 : {
> 		*(.lit8)
>diff --git a/arch/powerpc/kernel/vmlinux.lds.S
>b/arch/powerpc/kernel/vmlinux.lds.S
>index 7394b77..1c24c89 100644
>--- a/arch/powerpc/kernel/vmlinux.lds.S
>+++ b/arch/powerpc/kernel/vmlinux.lds.S
>@@ -312,6 +312,8 @@ SECTIONS
> 		NOSAVE_DATA
> 	}
> 
>+	BUG_TABLE
>+
> 	. = ALIGN(PAGE_SIZE);
> 	_edata  =  .;
> 	PROVIDE32 (edata = .);
>diff --git a/arch/x86/kernel/vmlinux.lds.S
>b/arch/x86/kernel/vmlinux.lds.S
>index c74ae9c..c8a3b61 100644
>--- a/arch/x86/kernel/vmlinux.lds.S
>+++ b/arch/x86/kernel/vmlinux.lds.S
>@@ -146,6 +146,7 @@ SECTIONS
> 		_edata = .;
> 	} :data
> 
>+	BUG_TABLE
> 
> 	. = ALIGN(PAGE_SIZE);
> 	__vvar_page = .;

Case in point why we want structured linker tables, btw...
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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