Messages in this thread | | | Date | Tue, 7 Dec 2021 17:57:04 +0200 | From | Mike Rapoport <> | Subject | Re: [PATCH] arm: remove [_text, _stext) from kernel code resource |
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On Fri, Dec 03, 2021 at 10:14:16PM +0800, Mark-PK Tsai wrote: > Remove the [_text, _stext) from Kernel Code. > Although there are some startup code in head.text, they > are freed to the buddy system after kernel boot.
Hmm, I don't see it is being freed anywhere. Can you elaborate when and how the range [_text, _stext) is freed?
> And we have memory protection mechanism use this > which have false alarm when some other IPs doing dma > if the dma page frame is in the [_text, _stext). > > Below are my iomem resource and reserved memory information: > console:/ # grep Kernel /proc/iomem > 20208000-219fffff : Kernel code > 21b00000-21c2e76f : Kernel data > > console:/ # cat /sys/kernel/debug/memblock/reserved > 0: 0x20201000..0x20207fff > 1: 0x20300000..0x21c2e76f
What are the addresses of _text and _stext in your configuration? What these dumps are supposed to show here?
> Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com> > --- > arch/arm/kernel/setup.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c > index 284a80c0b6e1..85ffc9501e38 100644 > --- a/arch/arm/kernel/setup.c > +++ b/arch/arm/kernel/setup.c > @@ -851,7 +851,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc) > struct resource *res; > u64 i; > > - kernel_code.start = virt_to_phys(_text); > + kernel_code.start = virt_to_phys(_stext); > kernel_code.end = virt_to_phys(__init_begin - 1); > kernel_data.start = virt_to_phys(_sdata); > kernel_data.end = virt_to_phys(_end - 1); > -- > 2.18.0 >
-- Sincerely yours, Mike.
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