vmlinux.lds: Fix TEXT_MAIN to include .text.start and friends

Since:

  6568f14cb5ae ("vmlinux.lds: Exclude .text.startup and .text.exit from TEXT_MAIN")

the TEXT_MAIN macro uses a series of patterns to prevent the
.text.startup[.*] and .text.exit[.*] sections from getting
linked into the vmlinux runtime .text.

That commit is a tad too aggressive: it also inadvertently filters out
valid runtime text sections like .text.start and
.text.start.constprop.0, which can be generated for a function named
start() when -ffunction-sections is enabled.

As a result, those sections become orphans when building with
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION for arm:

  arm-linux-gnueabi-ld: warning: orphan section `.text.start.constprop.0' from `drivers/usb/host/sl811-hcd.o' being placed in section `.text.start.constprop.0'
  arm-linux-gnueabi-ld: warning: orphan section `.text.start.constprop.0' from `drivers/media/dvb-frontends/drxk_hard.o' being placed in section `.text.start.constprop.0'
  arm-linux-gnueabi-ld: warning: orphan section `.text.start' from `drivers/media/dvb-frontends/stv0910.o' being placed in section `.text.start'
  arm-linux-gnueabi-ld: warning: orphan section `.text.start.constprop.0' from `drivers/media/pci/ddbridge/ddbridge-sx8.o' being placed in section `.text.start.constprop.0'

Fix that by explicitly adding the partial "substring" sections (.text.s,
.text.st, .text.sta, etc) and their cloned derivatives.

While this unfortunately means that TEXT_MAIN continues to grow,
these changes are ultimately necessary for proper support of
-ffunction-sections.

Fixes: 6568f14cb5ae ("vmlinux.lds: Exclude .text.startup and .text.exit from TEXT_MAIN")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: live-patching@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://patch.msgid.link/cd588144e63df901a656b06b566855019c4a931d.1762991150.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/oe-kbuild-all/202511040812.DFGedJiy-lkp@intel.com/

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index cc060adfdc7546b1c6252e9c199ee46a97b335f2..8f92d665cb0f60c77e316291e527a205c276abbc 100644 (file)
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -90,8 +90,9 @@
  * Support -ffunction-sections by matching .text and .text.*,
  * but exclude '.text..*', .text.startup[.*], and .text.exit[.*].
  *
- * .text.startup and .text.startup.* are matched later by INIT_TEXT.
- * .text.exit and .text.exit.* are matched later by EXIT_TEXT.
+ * .text.startup and .text.startup.* are matched later by INIT_TEXT, and
+ * .text.exit and .text.exit.* are matched later by EXIT_TEXT, so they must be
+ * explicitly excluded here.
  *
  * Other .text.* sections that are typically grouped separately, such as
  * .text.unlikely or .text.hot, must be matched explicitly before using
@@ -100,16 +101,16 @@
 #define TEXT_MAIN                                                      \
        .text                                                           \
        .text.[_0-9A-Za-df-rt-z]*                                       \
-       .text.s[_0-9A-Za-su-z]*                                         \
-       .text.st[_0-9A-Zb-z]*                                           \
-       .text.sta[_0-9A-Za-qs-z]*                                       \
-       .text.star[_0-9A-Za-su-z]*                                      \
-       .text.start[_0-9A-Za-tv-z]*                                     \
-       .text.startu[_0-9A-Za-oq-z]*                                    \
+       .text.s[_0-9A-Za-su-z]*         .text.s         .text.s.*       \
+       .text.st[_0-9A-Zb-z]*           .text.st        .text.st.*      \
+       .text.sta[_0-9A-Za-qs-z]*       .text.sta       .text.sta.*     \
+       .text.star[_0-9A-Za-su-z]*      .text.star      .text.star.*    \
+       .text.start[_0-9A-Za-tv-z]*     .text.start     .text.start.*   \
+       .text.startu[_0-9A-Za-oq-z]*    .text.startu    .text.startu.*  \
        .text.startup[_0-9A-Za-z]*                                      \
-       .text.e[_0-9A-Za-wy-z]*                                         \
-       .text.ex[_0-9A-Za-hj-z]*                                        \
-       .text.exi[_0-9A-Za-su-z]*                                       \
+       .text.e[_0-9A-Za-wy-z]*         .text.e         .text.e.*       \
+       .text.ex[_0-9A-Za-hj-z]*        .text.ex        .text.ex.*      \
+       .text.exi[_0-9A-Za-su-z]*       .text.exi       .text.exi.*     \
        .text.exit[_0-9A-Za-z]*
 
 /*