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From: Jim Cromie <jim.cromie@gmail.com>
To: jbaron@akamai.com, gregkh@linuxfoundation.org,
	linux-kernel@vger.kernel.org
Cc: Jim Cromie <jim.cromie@gmail.com>, lkp@intel.com
Subject: [RFC PATCH v6 18/34] dyndbg: prevent build bugs via -DNO_DYNAMIC_DEBUG_TABLE
Date: Sat, 29 May 2021 14:00:13 -0600	[thread overview]
Message-ID: <20210529200029.205306-19-jim.cromie@gmail.com> (raw)
In-Reply-To: <20210529200029.205306-1-jim.cromie@gmail.com>

The next patch adds DEFINE_DYNAMIC_DEBUG_TABLE(), which broke several
subtrees, including efi, vdso, and some of arch/*/boot/compressed,
with various relocation errors, iirc.

Avoid those problems by adding a define to suppress the "transparent"
DEFINE_DYNAMIC_DEBUG_TABLE() invocation.  I found the x86 problems
myself, lkp@intel.com found arm & sparc problems, and may yet find
others.

Reported-by: <lkp@intel.com> # on [jimc:lkp-test/dyndbg-diet] recently
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 arch/arm/boot/compressed/Makefile     | 2 ++
 arch/sparc/vdso/Makefile              | 2 ++
 arch/x86/boot/compressed/Makefile     | 1 +
 arch/x86/entry/vdso/Makefile          | 3 +++
 arch/x86/purgatory/Makefile           | 1 +
 drivers/firmware/efi/libstub/Makefile | 3 ++-
 6 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index fd94e27ba4fa..72f056a00ad4 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -82,6 +82,8 @@ compress-$(CONFIG_KERNEL_LZMA) = lzma
 compress-$(CONFIG_KERNEL_XZ)   = xzkern
 compress-$(CONFIG_KERNEL_LZ4)  = lz4
 
+KBUILD_CFLAGS += -DNO_DYNAMIC_DEBUG_TABLE
+
 libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
 
 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
diff --git a/arch/sparc/vdso/Makefile b/arch/sparc/vdso/Makefile
index c5e1545bc5cf..960ed0fb6804 100644
--- a/arch/sparc/vdso/Makefile
+++ b/arch/sparc/vdso/Makefile
@@ -30,6 +30,8 @@ obj-y += $(vdso_img_objs)
 targets += $(vdso_img_cfiles)
 targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so)
 
+KBUILD_CFLAGS += -DNO_DYNAMIC_DEBUG_TABLE
+
 CPPFLAGS_vdso.lds += -P -C
 
 VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index e0bc3988c3fa..ada4eb960d95 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -31,6 +31,7 @@ targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
 KBUILD_CFLAGS := -m$(BITS) -O2
 KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
+KBUILD_CFLAGS += -DNO_DYNAMIC_DEBUG_TABLE
 cflags-$(CONFIG_X86_32) := -march=i386
 cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
 KBUILD_CFLAGS += $(cflags-y)
diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 05c4abc2fdfd..619878f2c427 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -29,6 +29,9 @@ vobjs32-y := vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o
 vobjs32-y += vdso32/vclock_gettime.o
 vobjs-$(CONFIG_X86_SGX)	+= vsgx.o
 
+# avoid a x86_64_RELATIVE error
+KBUILD_CFLAGS += -DNO_DYNAMIC_DEBUG_TABLE
+
 # files to link into kernel
 obj-y				+= vma.o extable.o
 KASAN_SANITIZE_vma.o		:= y
diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 95ea17a9d20c..95ba7b18410f 100644
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -35,6 +35,7 @@ PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
 PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0
 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
 PURGATORY_CFLAGS += -fno-stack-protector
+PURGATORY_CFLAGS += -DNO_DYNAMIC_DEBUG_TABLE
 
 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index c23466e05e60..def8febefbd3 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -13,7 +13,8 @@ cflags-$(CONFIG_X86)		+= -m$(BITS) -D__KERNEL__ \
 				   -Wno-pointer-sign \
 				   $(call cc-disable-warning, address-of-packed-member) \
 				   $(call cc-disable-warning, gnu) \
-				   -fno-asynchronous-unwind-tables
+				   -fno-asynchronous-unwind-tables \
+				   -DNO_DYNAMIC_DEBUG_TABLE
 
 # arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly
 # disable the stackleak plugin
-- 
2.31.1


  parent reply	other threads:[~2021-05-29 20:03 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-29 19:59 [RFC PATCH v6 00/34] DYNAMIC_DEBUG diet progress, dropped 30kb Jim Cromie
2021-05-29 19:59 ` [RFC PATCH v6 01/34] dyndbg: avoid calling dyndbg_emit_prefix when it has no work Jim Cromie
2021-05-29 19:59 ` [RFC PATCH v6 02/34] dyndbg: drop uninformative vpr_info Jim Cromie
2021-05-29 19:59 ` [RFC PATCH v6 03/34] dyndbg: display KiB of data memory used Jim Cromie
2021-05-29 19:59 ` [RFC PATCH v6 04/34] dyndbg: split struct _ddebug's display fields to new _ddebug_site Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 05/34] dyndbg: __init iterate over __dyndbg & __dyndbg_site in parallel Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 06/34] dyndbg+module: expose ddebug_sites to modules Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 07/34] dyndbg: refactor part of ddebug_change to ddebug_match_site Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 08/34] dyndbg: accept null site in ddebug_match_site Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 09/34] dyndbg: hoist ->site out of ddebug_match_site Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 10/34] dyndbg: accept null site in ddebug_change Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 11/34] dyndbg: accept null site in dynamic_emit_prefix Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 12/34] dyndbg: accept null site in ddebug_proc_show Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 13/34] dyndbg: refactor ddebug_alter_site out of ddebug_change Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 14/34] dyndbg: allow deleting site info via control interface Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 15/34] dyndbg: add ddebug_site(_get|_put) abstraction Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 16/34] dyndbg: ddebug_add_module avoid adding empty modules Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 17/34] dyndbg: add _index to struct _ddebug Jim Cromie
2021-05-29 20:00 ` Jim Cromie [this message]
2021-05-29 20:00 ` [RFC PATCH v6 19/34] dyndbg: RFC - DEFINE_DYNAMIC_DEBUG_TABLE Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 20/34] dyndbg: RFC handle __dyndbg* sections in module.lds.h Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 21/34] dyndbg: ddebug_add_module() handle headers Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 22/34] dyndbg: validate ddebug_site_get invariants Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 23/34] dyndbg: fix NULL deref after deleting sites Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 24/34] dyndbg: dont show header records in control Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 25/34] dyndbg: make site pointer and checks on it optional (almost) Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 26/34] dyndbg: swap WARN_ON for BUG_ON see what 0-day says Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 27/34] dyndbg: fixup protect header when deleting site Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 28/34] dyndbg: unionize _ddebug*_headers with struct _ddebug* Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 29/34] dyndbg: RFC drop _ddebug.site pointer Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 30/34] dyndbg: split/copy ._index into 2 new fields: ._back, ._map Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 31/34] dyndbg: detect repeated site recs in add_module Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 32/34] dyndbg: pack module pr_debug sites Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 33/34] dyndbg: pack pr-debug site-recs in builtin modules Jim Cromie
2021-05-29 20:00 ` [RFC PATCH v6 34/34] dyndbg: prototype print-once and print-ratelimited RFC Jim Cromie

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