c53aeca059
Most system calls seems to get added to i386 first. This patch automatically generates a warning for any new system call which is implemented on i386 but not the architecture currently being compiled. On PowerPC at the moment, for example, it results in these warnings: init/missing_syscalls.h:935:3: warning: #warning syscall sync_file_range not implemented init/missing_syscalls.h:947:3: warning: #warning syscall getcpu not implemented init/missing_syscalls.h:950:3: warning: #warning syscall epoll_pwait not implemented The file scripts/checksyscalls.sh list a number of legacy system calls that are ignored because they only makes sense on i386 systems. Other contributors to this patch are Russell King <rmk+lkml@arm.linux.org.uk> and Stéphane Jourdois <kwisatz@rubis.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
1.5 KiB
Kbuild for top-level directory of the kernel
This file takes care of the following:
1) Generate asm-offsets.h
2) Check for missing system calls
1) Generate asm-offsets.h
offsets-file := include/asm-$(ARCH)/asm-offsets.h
always := $(offsets-file) targets := $(offsets-file) targets += arch/$(ARCH)/kernel/asm-offsets.s
Default sed regexp - multiline due to syntax constraints
define sed-y
"/^->/{s:^->[^ ]* [$$#][^ ]* .*:#define \1 \2 / \3 */:; s:->::; p;}"
endef
Override default regexp for specific architectures
sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ #.*$$//; p;}"
quiet_cmd_offsets = GEN $@
define cmd_offsets
(set -e;
echo "#ifndef ASM_OFFSETS_H";
echo "#define ASM_OFFSETS_H";
echo "/*";
echo " * DO NOT MODIFY.";
echo " *";
echo " * This file was generated by Kbuild";
echo " *";
echo " */";
echo "";
sed -ne $(sed-y) $<;
echo "";
echo "#endif" ) > $@
endef
We use internal kbuild rules to avoid the "is up to date" message from make
arch/$(ARCH)/kernel/asm-offsets.s: arch/$(ARCH)/kernel/asm-offsets.c FORCE $(Q)mkdir -p $(dir $@) $(call if_changed_dep,cc_s_c)
$(obj)/$(offsets-file): arch/$(ARCH)/kernel/asm-offsets.s Kbuild $(Q)mkdir -p $(dir $@) $(call cmd,offsets)
2) Check for missing system calls
quiet_cmd_syscalls = CALL $< cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
PHONY += missing-syscalls missing-syscalls: scripts/checksyscalls.sh FORCE $(call cmd,syscalls)