scripts/kernel-functions: Make it possible to build older kernels with gcc 10

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@9027 d57e44dd-8a1f-0410-8b47-8ef2f437770f
2026-05-14 09:11:27 +00:00 · 2020-06-21 16:07:16 +00:00
parent f7b704ee99
commit 8174bad3da
2 changed files with 109 additions and 31 deletions
--- a/scripts/kernel-functions
+++ b/scripts/kernel-functions
@@ -127,15 +127,20 @@ function extract_kernel_tree {

 # Patch a kernel tree where $1 is the kernel version.
 function patch_kernel {
-    case "$k" in
+    case "$1" in
 	*^*)
            # RHEL / CentOS.
            ;;
-	2.*|3.*)
-            # Tell the kernel that we are using gcc 4.6 since older kernel
-            # versions do not support recent gcc versions.
-            KCFLAGS="-U__GNUC__ -U__GNUC_MINOR__ -D__GNUC__=4 -D__GNUC_MINOR__=6"
-	    patch -p1 <<'EOF'
+	*)
+	    # See also commit f153b82121b0 ("Sanitize gcc version header
+	    # includes") # v2.6.29. See also commit 71458cfc782e ("kernel: add
+	    # support for gcc 5") # v3.18. See also commit cb984d101b30
+	    # ("compiler-gcc: integrate the various compiler-gcc[345].h
+	    # files") # v4.2.
+	    if kernel_version_le 2.6.29 $1 && kernel_version_lt $1 4.2; then
+		# Tell the kernel that we are using gcc 4.6 since older kernel
+		# versions do not support recent gcc versions.
+		patch -f -s -p1 <<'EOF'
 diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
 index 02ae99e8e6d3..47e12c19c965 100644
 --- a/include/linux/compiler-gcc.h
@@ -150,6 +155,48 @@ index 02ae99e8e6d3..47e12c19c965 100644
 #if !defined(__noclone)
 #define __noclone	/* not needed */
 EOF
+		patch -f -s -p1 <<'EOF' ||
+diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
+index 769e19864632..2ec6c7a11502 100644
+--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
+@@ -2,13 +2,6 @@
+ #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
+ #endif
+ 
+-/* GCC 4.1.[01] miscompiles __weak */
+-#ifdef __KERNEL__
+-# if GCC_VERSION >= 40100 &&  GCC_VERSION <= 40101
+-#  error Your version of gcc miscompiles the __weak directive
+-# endif
+-#endif
+-
+ #define __used			__attribute__((__used__))
+ #define __must_check 		__attribute__((warn_unused_result))
+ #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
+EOF
+		patch -f -s -p1 <<'EOF'
+diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
+index 412bc6c2b023..901ca31be7f8 100644
+--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
+@@ -2,13 +2,6 @@
+ #error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
+ #endif
+ 
+-/* GCC 4.1.[01] miscompiles __weak */
+-#ifdef __KERNEL__
+-# if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
+-#  error Your version of gcc miscompiles the __weak directive
+-# endif
+-#endif
+-
+ #define __used			__attribute__((__used__))
+ #define __must_check 		__attribute__((warn_unused_result))
+ #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
+EOF
+	    fi
+	    ;;
    esac

    if [ "$1" = "2.6.29" ] || [ "$1" = "2.6.29.1" ] || [ "$1" = "2.6.29.2" ] ||
@@ -362,9 +409,8 @@ index d6d65537b0d9..6aad8308a0ac 100644
 EOF
    fi

-    case "$1" in
-	2.6.3[6-9]*|3.[0-9]|3.[0-9].*|3.1[01345]|3.1[01345].*|3.1[789]|3.1[789].*|4.[023567]|4.[023567].*)
-	    patch -p1 <<'EOF'
+    if kernel_version_le 2.6.36 $1 && kernel_version_lt $1 4.8; then
+	patch -f -s -p1 <<'EOF'
 From c6a385539175ebc603da53aafb7753d39089f32e Mon Sep 17 00:00:00 2001
 From: Borislav Petkov <bp@suse.de>
 Date: Mon, 14 Nov 2016 19:41:31 +0100
@@ -426,10 +472,11 @@ index 0ed6ce300543..c324b43712f0 100644
 KBUILD_CFLAGS_MODULE  := -DMODULE
 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 EOF
-	    ;;
-	# CentOS 6.x.
-	2.6.32-*)
-	    patch -p1 <<'EOF'
+    else
+	case "$1" in
+	    # CentOS 6.x.
+	    2.6.32-*)
+		patch -f -s -p1 <<'EOF'
 --- linux-2.6.32-754.29.1.el6/Makefile.orig	2020-05-13 14:09:18.448503420 -0700
 +++ linux-2.6.32-754.29.1.el6/Makefile	2020-05-13 14:11:24.265441790 -0700
@@ -355,7 +355,8 @@
@@ -452,9 +499,9 @@ EOF
 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 EOF
-	    ;;
-	2.6.3[1-5]*)
-	    patch -p1 <<'EOF'
+		;;
+	    2.6.3[1-5]*)
+		patch -f -s -p1 <<'EOF'
 diff --git a/Makefile b/Makefile
 index 141da26fda4b..343ec388ae2e 100644
 --- a/Makefile
@@ -477,11 +524,12 @@ index 141da26fda4b..343ec388ae2e 100644
 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 EOF
 	    ;;
-    esac
+	 esac
+    fi

    case "$1" in
 	4.18.0-*) # CentOS 8.x
-	    patch -p1 <<'EOF'
+	    patch -f -s -p1 <<'EOF'
 From a6e60d84989fa0e91db7f236eda40453b0e44afa Mon Sep 17 00:00:00 2001
 From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
 Date: Sat, 19 Jan 2019 20:59:34 +0100
@@ -560,8 +608,8 @@ index 8fa38d3e7538..f5bc4c046461 100644
 
 EOF
 	;;
-	2.6.32-*|3.10.0-*) # CentOS 6.x and 7.x
-	    patch -p1 <<'EOF'
+	2.*|3.*)
+	    patch -f -s -p1 <<'EOF'
 --- linux-3.10.0-1127.el7/include/linux/init.h.orig	2020-05-09 20:55:48.638956513 -0700
 +++ linux-3.10.0-1127.el7/include/linux/init.h	2020-05-09 20:56:46.947612445 -0700
@@ -309,13 +309,15 @@
@@ -586,6 +634,46 @@ EOF
 	    ;;
    esac

+    if kernel_version_le 3.2 $1 && kernel_version_lt $1 3.18; then
+	patch -f -s -p1 <<'EOF'
+From eeeda4cd06e828b331b15741a204ff9f5874d28d Mon Sep 17 00:00:00 2001
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Wed, 24 Sep 2014 13:30:12 +0100
+Subject: [PATCH] x86/relocs: Make per_cpu_load_addr static
+
+per_cpu_load_addr is only used for 64-bit relocations, but is
+declared in both configurations of relocs.c - with different
+types.  This has undefined behaviour in general.  GNU ld is
+documented to use the larger size in this case, but other tools
+may differ and some warn about this.
+
+References: https://bugs.debian.org/748577
+Reported-by: Michael Tautschnig <mt@debian.org>
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+Cc: 748577@bugs.debian.org
+Cc: Linus Torvalds <torvalds@linux-foundation.org>
+Link: http://lkml.kernel.org/r/1411561812.3659.23.camel@decadent.org.uk
+Signed-off-by: Ingo Molnar <mingo@kernel.org>
+---
+ arch/x86/tools/relocs.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
+index bbb1d2259ecf..a5efb21d5228 100644
+--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
+@@ -695,7 +695,7 @@ static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
+  *
+  */
+ static int per_cpu_shndx	= -1;
+-Elf_Addr per_cpu_load_addr;
+static Elf_Addr per_cpu_load_addr;
+ 
+ static void percpu_init(void)
+ {
+EOF
+    fi
+
    # Use sed to patch the ____ilog2_NaN() prototype.
    sed -i 's/__attribute__((const, noreturn))/__attribute__((noreturn))/' \
 	include/linux/log2.h tools/include/linux/log2.h 2>/dev/null
--- a/scripts/run-regression-tests
+++ b/scripts/run-regression-tests
@@ -677,17 +677,7 @@ do
  generate_kernel_patch "$k" "${generate_kernel_patch_options}" || continue
  (
      cd "${outputdir}" &&
-	  download_and_extract_kernel_tree "$k" &&
-	  k="${k/^*}" &&
-	  cd "linux-$k/include/linux" &&
-	  if [ ! -e compiler-gcc6.h ]; then
-	      for f in compiler-gcc5.h compiler-gcc4.h; do
-		  if [ -e "$f" ]; then
-		      cp "$f" compiler-gcc6.h
-		      break
-		  fi
-	      done
-	  fi
+	  download_and_extract_kernel_tree "$k"
  ) ||
      continue
  k="${k/^*}"