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lkm: tweak Kbuild to work on 4.x (hardcoded fallback stack size); add linuxkm/get_thread_size.c.

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This commit is contained in:
Daniel Pouzzner
2020-08-22 01:10:28 -05:00
parent c194fb3beb
commit d86b0601b9
2 changed files with 19 additions and 1 deletions
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7
linuxkm/Kbuild
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@ -20,11 +20,16 @@ ifeq "$(WOLFSSL_CFLAGS)" ""
$(error $$WOLFSSL_CFLAGS is unset.)
endif
# this mechanism only works in kernel 5.x+ (fallback to hardcoded value)
hostprogs := linuxkm/get_thread_size
always-y := $(hostprogs)
HOST_EXTRACFLAGS += $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CFLAGS) -static
# this rule is needed to get build to succeed in 4.x (get_thread_size still doesn't get built)
$(obj)/linuxkm/get_thread_size: $(src)/linuxkm/get_thread_size.c
$(patsubst %, $(obj)/%, $(WOLFSSL_OBJ_FILES)): $(obj)/linuxkm/get_thread_size
KERNEL_THREAD_STACK_SIZE=$(shell $(obj)/linuxkm/get_thread_size)
KERNEL_THREAD_STACK_SIZE=$(shell test -x $(obj)/linuxkm/get_thread_size && $(obj)/linuxkm/get_thread_size || echo 16384)
MAX_STACK_FRAME_SIZE=$(shell echo $$(( $(KERNEL_THREAD_STACK_SIZE) / 4)))
libwolfssl-y := $(WOLFSSL_OBJ_FILES)

13
linuxkm/get_thread_size.c Normal file
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@ -0,0 +1,13 @@
#ifndef __KERNEL__
#define __KERNEL__
#endif
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
extern int dprintf(int fd, const char *format, ...);
int main(__maybe_unused int argc, __maybe_unused char **argv) {
dprintf(1, "%lu\n",THREAD_SIZE);
return 0;
}