From 80e39311ff3d7d2267ea8d259aab8dc9d5a59d61 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Mon, 4 Feb 2008 22:31:17 -0800 Subject: [PATCH] uml: SMP locking commentary Add some more commentary about various pieces of global data not needing locking. Also got rid of unmap_physmem since that is no longer used. Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/drivers/net_kern.c | 7 ++++++- arch/um/include/mem_user.h | 1 - arch/um/kernel/mem.c | 13 ++++++++----- arch/um/kernel/physmem.c | 6 +++--- 4 files changed, 17 insertions(+), 10 deletions(-) diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c index 3c6c44ca1f..ca71577f36 100644 --- a/arch/um/drivers/net_kern.c +++ b/arch/um/drivers/net_kern.c @@ -368,7 +368,6 @@ static struct platform_driver uml_net_driver = { .name = DRIVER_NAME, }, }; -static int driver_registered; static void net_device_release(struct device *dev) { @@ -383,6 +382,12 @@ static void net_device_release(struct device *dev) free_netdev(netdev); } +/* + * Ensures that platform_driver_register is called only once by + * eth_configure. Will be set in an initcall. + */ +static int driver_registered; + static void eth_configure(int n, void *init, char *mac, struct transport *transport) { diff --git a/arch/um/include/mem_user.h b/arch/um/include/mem_user.h index 4e6707bd0a..46384acd54 100644 --- a/arch/um/include/mem_user.h +++ b/arch/um/include/mem_user.h @@ -56,7 +56,6 @@ extern void setup_physmem(unsigned long start, unsigned long usable, unsigned long len, unsigned long long highmem); extern void add_iomem(char *name, int fd, unsigned long size); extern unsigned long phys_offset(unsigned long phys); -extern void unmap_physmem(void); extern void map_memory(unsigned long virt, unsigned long phys, unsigned long len, int r, int w, int x); diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 663011c298..d948babfc6 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -22,17 +22,20 @@ unsigned long *empty_zero_page = NULL; /* allocated in paging_init and unchanged thereafter */ unsigned long *empty_bad_page = NULL; + +/* + * Initialized during boot, and readonly for initializing page tables + * afterwards + */ pgd_t swapper_pg_dir[PTRS_PER_PGD]; + +/* Initialized at boot time, and readonly after that */ unsigned long long highmem; int kmalloc_ok = 0; +/* Used during early boot */ static unsigned long brk_end; -void unmap_physmem(void) -{ - os_unmap_memory((void *) brk_end, uml_reserved - brk_end); -} - static void map_cb(void *unused) { map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0); diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c index 9c92900057..9757085a02 100644 --- a/arch/um/kernel/physmem.c +++ b/arch/um/kernel/physmem.c @@ -164,10 +164,10 @@ __uml_setup("iomem=", parse_iomem, * setup_iomem, both of which run during early boot. Afterwards, it's * unchanged. */ -struct iomem_region *iomem_regions = NULL; +struct iomem_region *iomem_regions; -/* Initialized in parse_iomem */ -int iomem_size = 0; +/* Initialized in parse_iomem and unchanged thereafter */ +int iomem_size; unsigned long find_iomem(char *driver, unsigned long *len_out) { -- 2.39.5