Commit 4356b11e authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Andrew Morton
Browse files

proc: support proc-empty-vm test on i386 

Unmap everything starting from 4GB length until it unmaps, otherwise test
has to detect which virtual memory split kernel is using.

Link: https://lkml.kernel.org/r/20230630183434.17434-1-adobriyan@gmail.com


Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Cc: Björn Töpel <bjorn@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 4099451a

tools/testing/selftests/proc/proc-empty-vm.c

+16 −0
Original line number Diff line number Diff line
@@ -37,6 +37,10 @@ 
#include <sys/wait.h>

#include <unistd.h>



#ifdef __amd64__

#define TEST_VSYSCALL

#endif



/*

 * 0: vsyscall VMA doesn't exist	vsyscall=none

 * 1: vsyscall VMA is --xp		vsyscall=xonly
@@ -119,6 +123,7 @@ static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___) 
	_exit(EXIT_FAILURE);

}



#ifdef TEST_VSYSCALL

static void sigaction_SIGSEGV_vsyscall(int _, siginfo_t *__, void *___)

{

	_exit(g_vsyscall);
@@ -170,6 +175,7 @@ static void vsyscall(void) 
		exit(1);

	}

}

#endif



static int test_proc_pid_maps(pid_t pid)

{
@@ -299,7 +305,9 @@ int main(void) 
{

	int rv = EXIT_SUCCESS;



#ifdef TEST_VSYSCALL

	vsyscall();

#endif



	switch (g_vsyscall) {

	case 0:
@@ -346,6 +354,14 @@ int main(void) 


#ifdef __amd64__

		munmap(NULL, ((size_t)1 << 47) - 4096);

#elif defined __i386__

		{

			size_t len;



			for (len = -4096;; len -= 4096) {

				munmap(NULL, len);

			}

		}

#else

#error "implement 'unmap everything'"

#endif