CODEWITHSUNDEEP
linuxlinux-kernellinux-device-drivermmu
TheLoneJoker
TheLoneJoker

Reputation: 1629

How many Pages do a certain number of Bytes amount to?

Given a system supports a certain page-size of X-KB (Power of 2), and I have a certain number of bytes Y-Bytes(May or May not be a multiple of X). Is there a macro that will give me a "ceil" of the number of pages that would amount to Y-Bytes ?

Thanks, vj

Upvotes: 0

Views: 161

Answers (1)

kaylum
kaylum

Reputation: 14046

Not sure if there is such a macro. But you can easily write your own using the asm/page.h PAGE_SIZE and PAGE_SHIFT definitions.

NUM_PAGES(y) ((y + PAGE_SIZE - 1) >> PAGE_SHIFT)

or

NUM_PAGES(y) ((y + PAGE_SIZE - 1) / PAGE_SIZE)

Upvotes: 1

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