[RESEND PATCH 0/4] um: build and irq fixes

[RESEND PATCH 0/4] um: build and irq fixes

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

I've previously sent these patches separately. I still don't see them
in next and I don't know what the policy is for picking up uml patches
but I thought I'd resend them rebased together on top of v5.1-rc3.

Bartosz Golaszewski (4):
  um: remove unused variable
  um: remove uses of variable length arrays
  um: define set_pte_at() as a static inline function, not a macro
  um: irq: don't set the chip for all irqs

 arch/um/include/asm/pgtable.h |  7 ++++++-
 arch/um/kernel/irq.c          |  2 +-
 arch/um/kernel/skas/uaccess.c |  1 -
 arch/um/os-Linux/umid.c       | 36 ++++++++++++++++++++++++++---------
 4 files changed, 34 insertions(+), 12 deletions(-)

-- 
2.21.0

[RESEND PATCH 1/4] um: remove unused variable

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

The buf variable is unused. Remove it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/um/kernel/skas/uaccess.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index 7f06fdbc7ee1..bd3cb694322c 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -59,7 +59,6 @@ static pte_t *maybe_map(unsigned long virt, int is_write)
 static int do_op_one_page(unsigned long addr, int len, int is_write,
 		 int (*op)(unsigned long addr, int len, void *arg), void *arg)
 {
-	jmp_buf buf;
 	struct page *page;
 	pte_t *pte;
 	int n;
-- 
2.21.0

[RESEND PATCH 2/4] um: remove uses of variable length arrays

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

While the affected code is run in user-mode, the build still warns
about it. Convert all uses of VLA to dynamic allocations.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/um/os-Linux/umid.c | 36 +++++++++++++++++++++++++++---------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c
index 998fbb445458..e261656fe9d7 100644
--- a/arch/um/os-Linux/umid.c
+++ b/arch/um/os-Linux/umid.c
@@ -135,12 +135,18 @@ static int remove_files_and_dir(char *dir)
  */
 static inline int is_umdir_used(char *dir)
 {
-	char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
-	char pid[sizeof("nnnnn\0")], *end;
+	char pid[sizeof("nnnnn\0")], *end, *file;
 	int dead, fd, p, n, err;
+	size_t filelen;
 
-	n = snprintf(file, sizeof(file), "%s/pid", dir);
-	if (n >= sizeof(file)) {
+	err = asprintf(&file, "%s/pid", dir);
+	if (err < 0)
+		return 0;
+
+	filelen = strlen(file);
+
+	n = snprintf(file, filelen, "%s/pid", dir);
+	if (n >= filelen) {
 		printk(UM_KERN_ERR "is_umdir_used - pid filename too long\n");
 		err = -E2BIG;
 		goto out;
@@ -185,6 +191,7 @@ static inline int is_umdir_used(char *dir)
 out_close:
 	close(fd);
 out:
+	free(file);
 	return 0;
 }
 
@@ -210,18 +217,21 @@ static int umdir_take_if_dead(char *dir)
 
 static void __init create_pid_file(void)
 {
-	char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
-	char pid[sizeof("nnnnn\0")];
+	char pid[sizeof("nnnnn\0")], *file;
 	int fd, n;
 
-	if (umid_file_name("pid", file, sizeof(file)))
+	file = malloc(strlen(uml_dir) + UMID_LEN + sizeof("/pid\0"));
+	if (!file)
 		return;
 
+	if (umid_file_name("pid", file, sizeof(file)))
+		goto out;
+
 	fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0644);
 	if (fd < 0) {
 		printk(UM_KERN_ERR "Open of machine pid file \"%s\" failed: "
 		       "%s\n", file, strerror(errno));
-		return;
+		goto out;
 	}
 
 	snprintf(pid, sizeof(pid), "%d\n", getpid());
@@ -231,6 +241,8 @@ static void __init create_pid_file(void)
 		       errno);
 
 	close(fd);
+out:
+	free(file);
 }
 
 int __init set_umid(char *name)
@@ -385,13 +397,19 @@ __uml_setup("uml_dir=", set_uml_dir,
 
 static void remove_umid_dir(void)
 {
-	char dir[strlen(uml_dir) + UMID_LEN + 1], err;
+	char *dir, err;
+
+	dir = malloc(strlen(uml_dir) + UMID_LEN + 1);
+	if (!dir)
+		return;
 
 	sprintf(dir, "%s%s", uml_dir, umid);
 	err = remove_files_and_dir(dir);
 	if (err)
 		os_warn("%s - remove_files_and_dir failed with err = %d\n",
 			__func__, err);
+
+	free(dir);
 }
 
 __uml_exitcall(remove_umid_dir);
-- 
2.21.0

[RESEND PATCH 3/4] um: define set_pte_at() as a static inline function, not a macro

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

When defined as macro, the mm argument is unused and subsequently the
variable passed as mm is considered unused by the compiler. This fixes
a build warning.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/um/include/asm/pgtable.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index 9c04562310b3..b377df76cc28 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -263,7 +263,12 @@ static inline void set_pte(pte_t *pteptr, pte_t pteval)
 	*pteptr = pte_mknewpage(*pteptr);
 	if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
 }
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
+			      pte_t *pteptr, pte_t pteval)
+{
+	set_pte(pteptr, pteval);
+}
 
 #define __HAVE_ARCH_PTE_SAME
 static inline int pte_same(pte_t pte_a, pte_t pte_b)
-- 
2.21.0

[RESEND PATCH 4/4] um: irq: don't set the chip for all irqs

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Setting a chip for an interrupt marks it as allocated. Since UM doesn't
support dynamic interrupt numbers (yet), it means we cannot simply
increase NR_IRQS and then use the free irqs between LAST_IRQ and NR_IRQS
with gpio-mockup or iio testing drivers as irq_alloc_descs() will fail
after not being able to neither find an unallocated range of interrupts
nor expand the range.

Only call irq_set_chip_and_handler() for irqs until LAST_IRQ.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/um/kernel/irq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index f4874b7ec503..598d7b3d9355 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -479,7 +479,7 @@ void __init init_IRQ(void)
 	irq_set_chip_and_handler(TIMER_IRQ, &SIGVTALRM_irq_type, handle_edge_irq);
 
 
-	for (i = 1; i < NR_IRQS; i++)
+	for (i = 1; i < LAST_IRQ; i++)
 		irq_set_chip_and_handler(i, &normal_irq_type, handle_edge_irq);
 	/* Initialize EPOLL Loop */
 	os_setup_epoll();
-- 
2.21.0

Re: [RESEND PATCH 0/4] um: build and irq fixes

[Bartosz Golaszewski]

śr., 3 kwi 2019 o 10:39 Bartosz Golaszewski <brgl@bgdev.pl> napisał(a):
>
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> I've previously sent these patches separately. I still don't see them
> in next and I don't know what the policy is for picking up uml patches
> but I thought I'd resend them rebased together on top of v5.1-rc3.
>

And of course I forgot to pick up acks from Anton...

> Bartosz Golaszewski (4):
>   um: remove unused variable
>   um: remove uses of variable length arrays
>   um: define set_pte_at() as a static inline function, not a macro
>   um: irq: don't set the chip for all irqs
>
>  arch/um/include/asm/pgtable.h |  7 ++++++-
>  arch/um/kernel/irq.c          |  2 +-
>  arch/um/kernel/skas/uaccess.c |  1 -
>  arch/um/os-Linux/umid.c       | 36 ++++++++++++++++++++++++++---------
>  4 files changed, 34 insertions(+), 12 deletions(-)
>
> --
> 2.21.0
>

Re: [RESEND PATCH 0/4] um: build and irq fixes

[Anton Ivanov]

On 03/04/2019 09:39, Bartosz Golaszewski wrote:
> śr., 3 kwi 2019 o 10:39 Bartosz Golaszewski <brgl@bgdev.pl> napisał(a):
>>
>> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>>
>> I've previously sent these patches separately. I still don't see them
>> in next and I don't know what the policy is for picking up uml patches
>> but I thought I'd resend them rebased together on top of v5.1-rc3.
>>
> 


I test and ack stuff to the extent I can (especially the areas which I 
have worked on recently). Richard has the final say for what goes in on 
the next merge and he does it based on his own and my testing and/or 
markings in patchwork.


> And of course I forgot to pick up acks from Anton...

Indeed - I have acked some of these :)

> 
>> Bartosz Golaszewski (4):
>>    um: remove unused variable
>>    um: remove uses of variable length arrays
>>    um: define set_pte_at() as a static inline function, not a macro
>>    um: irq: don't set the chip for all irqs
>>
>>   arch/um/include/asm/pgtable.h |  7 ++++++-
>>   arch/um/kernel/irq.c          |  2 +-
>>   arch/um/kernel/skas/uaccess.c |  1 -
>>   arch/um/os-Linux/umid.c       | 36 ++++++++++++++++++++++++++---------
>>   4 files changed, 34 insertions(+), 12 deletions(-)
>>
>> --
>> 2.21.0
>>
> 
> _______________________________________________
> linux-um mailing list
> linux-um@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-um
> 

-- 
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/

[RESEND PATCH 1/4] um: remove unused variable

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

The buf variable is unused. Remove it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Acked-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
---
 arch/um/kernel/skas/uaccess.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index 7f06fdbc7ee1..bd3cb694322c 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -59,7 +59,6 @@ static pte_t *maybe_map(unsigned long virt, int is_write)
 static int do_op_one_page(unsigned long addr, int len, int is_write,
 		 int (*op)(unsigned long addr, int len, void *arg), void *arg)
 {
-	jmp_buf buf;
 	struct page *page;
 	pte_t *pte;
 	int n;
-- 
2.21.0