[tip: timers/vdso] kbuild: Support generated asm-headers in subdirectories

[tip-bot2 for Thomas Weißschuh]

The following commit has been merged into the timers/vdso branch of tip:

Commit-ID:     2d69b891e6461eb3dc9af4741ded915966db4e01
Gitweb:        https://git.kernel.org/tip/2d69b891e6461eb3dc9af4741ded915966db4e01
Author:        Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
AuthorDate:    Fri, 24 Jul 2026 15:36:18 +02:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxx>
CommitterDate: Mon, 10 Aug 2026 16:25:21 +02:00

kbuild: Support generated asm-headers in subdirectories

Extend the asm-header stub generation to also handle subdirectories.
An upcoming vdso/ header refactoring requires this.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
Reviewed-by: Nicolas Schier <nsc@xxxxxxxxxx>
Link: https://patch.msgid.link/20260724-vdso-arch-clockmodes-v4-1-ddbe447be860@xxxxxxxxxxxxx
---
 scripts/Makefile.asm-headers | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/scripts/Makefile.asm-headers b/scripts/Makefile.asm-headers
index 8a4856e..b389313 100644
--- a/scripts/Makefile.asm-headers
+++ b/scripts/Makefile.asm-headers
@@ -48,14 +48,13 @@ syscall-y   := $(addprefix $(obj)/, $(syscall-y))
 generated-y := $(addprefix $(obj)/, $(generated-y))
 
 # Remove stale wrappers when the corresponding files are removed from generic-y
-old-headers := $(wildcard $(obj)/*.h)
+old-headers := $(shell test -d $(obj) && find $(obj) -name *.h)
 unwanted    := $(filter-out $(generic-y) $(generated-y) $(syscall-y),$(old-headers))
 
-quiet_cmd_wrap = WRAP    $@
-      cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
+filechk_wrap = echo "\#include <asm-generic/$*.h>"
 
 quiet_cmd_remove = REMOVE  $(unwanted)
-      cmd_remove = rm -f $(unwanted)
+      cmd_remove = rm -f $(unwanted); find $(obj) -type d -empty -delete
 
 quiet_cmd_syshdr = SYSHDR  $@
       cmd_syshdr = $(CONFIG_SHELL) $(syshdr) \
@@ -74,8 +73,8 @@ all: $(generic-y) $(syscall-y)
 	$(if $(unwanted),$(call cmd,remove))
 	@:
 
-$(obj)/%.h: $(srctree)/$(generic)/%.h
-	$(call cmd,wrap)
+$(obj)/%.h: $(srctree)/$(generic)/%.h FORCE
+	$(call filechk,wrap)
 
 $(obj)/unistd_%.h: $(syscalltbl) $(syshdr) FORCE
 	$(call if_changed,syshdr)